dt-bindings: reset: rcar-rst: Document r8a774c0 rst

Document bindings for the RZ/G2E (a.k.a. R8A774C0) reset
module.
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Biju Das <biju.das@bp.renesas.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

Documentation/devicetree/bindings/reset/renesas,rst.txt

@@ -19,6 +19,7 @@ Required properties:
 		  - "renesas,r8a7745-rst" (RZ/G1E)
 		  - "renesas,r8a77470-rst" (RZ/G1C)
 		  - "renesas,r8a774a1-rst" (RZ/G2M)
+		  - "renesas,r8a774c0-rst" (RZ/G2E)
 		  - "renesas,r8a7778-reset-wdt" (R-Car M1A)
 		  - "renesas,r8a7779-reset-wdt" (R-Car H1)
 		  - "renesas,r8a7790-rst" (R-Car H2)